If you want to buy or sell an item fast and do not see it on the Market then you can advertise in whatever city you are in or on the Advertising Channel. If you get a buyer/seller who is in another city you do not need to take a Boat or Magic Carpet but can simply walk to the Temple in your city and from there travel to the Adventurer's Guild.
The Adventurer's Guild is on an island that is a Protection Zone and it can be accessed by using an Adventurer's Stone inside any Temple. If you do not already have a Stone then just ask the Temple NPC for an "Adventurer's Stone" to get one for free. There is a Banker NPC, Kepar, so you do not need to carry money to the temple and a Postbox so you can mail your items to your Inbox but make sure to bring a Parcel and Label.
TibiaWiki is a Wiki project which was started by Erig on November 22, 2004. It has since become one of the largest and most often updated sources of Tibian information on the internet, reaching up to more than 1,900,000 visits a month from which more than 450,000 are absolutely unique (as of 2010, ranking second among all supported/promoted fansites). It is also the most favourite fansite as of this poll. Of course, its popularity is only because of the dedicated people that contribute.
When Erig.net became a Supported Fansite on November 24, 2005, TibiaWiki, being part of that site, became a supported fansite too. However TibiaWiki had an immense slowness during peak times under the old domain because of its popularity among Tibia players. The new domain hosted by Wikia provides a better availability of this well-liked fansite, which has been supported since January 22, 2008. With the introduction of the new fansite programme, TibiaWiki became a promoted fansite, on November 11, 2008.
If you want to introduce yourself or just want the visitors to know something about you you can make your own userpage, here is a guide on how to do this also containing basic editing tips. You also can use this or this template. It is recommended to preview (alt+p) your page before you save it (alt+s). This will save you time and will simplify your editing. If you have a question please post it to one of the Admins or the Admin Talk Page.